Ta be the armature torque and Ia be the armature current then which of the following relation is valid for DC series motor before saturation?

Q. Ta be the armature torque and Ia be the armature current then which of the following relation is valid for DC series motor before saturation?

A.            Ta ∝ Ia

B.            Ta ∝ Ia2

C.            Ta ∝ 1/Ia

D.            Ta ∝ 1/Ia2

Answer: Ta ∝ Ia2